Articles

== We know this because in it states so in the artical below. Which has been built on by facts. Look at papragraphs 1 and 2. Nature gives a signal that it's time for leaves to change color by the weather either becomeing cold or hot out, and the sun going down quicker. Good answer Leaves change color and fall off so late in the year because of the weather. Ok =Why do Leaves Change Color= ==Every leaf of the tree is a tiny factory that works day in and day out to produce food, that is, energy. The leaf colors are due to the presence of 3 very important pigments present in the plant cell structure and parts...== [|**New Delhi**]
 * How do we know that Carotenoids are more stable compounds than chlorophyll?**
 * How does nature signal it's time for leaves to change color? **
 * How would you explain the reason the leaves changing colors and falling off so late this year?**

**The Splendor of Autumn** Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer to winter.During the spring and summer the leaves have served as factories where most of the foods necessary for the tree's growth are manufactured. This food-making process takes place in the leaf in numerous cells containing chlorophyll, which gives the leaf its green color. This extraordinary chemical absorbs from sunlight the energy that is used in transforming carbon dioxide and water to carbohydrates, such as sugars and starch.Along with the green pigment are yellow to orange pigments, carotenes and xanthophyll pigments which, for example, give the orangecolor to a carrot. Most of the year these colors are masked by great amounts of green coloring. This paragraph talks about leaves and how they change colors and why they're on the trees. But in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor. At the same time other chemical changes may occur, which form additional colors through the development of red anthocyanin pigments. Some mixtures give rise to the reddish and purplish fall colors of trees such as dogwoods and sumacs, while others give the sugar maple its brilliant orange.The autumn foliage of some trees show only yellow colors. Others, like many oaks, display mostly browns. All these colors are due to the mixing of varying amounts of the chlorophyll residue and other pigments in the leaf during the fall season. This paragraph talks about the leaves, and how chlorophyll breaks down. As the fall colors appear, other changes are taking place. At the point where the stem of the leaf is attached to the tree, a special layer of cells develops and gradually severs the tissues that support the leaf. At the same time, the tree seals the cut, so that when the leaf is finally blown off by the wind or falls from its own weight, it leaves behind a leaf scar.Most of the broad-leaved trees in the North shed their leaves in the fall. However, the dead brown leaves of the oaks and a few other species may stay on the tree until growth starts again in the spring. In the South, where the winters are mild, some of the broad-leaved trees are evergreen; that is, the leaves stay on the trees during winter and keep their green color. This paragraph talks about the changes. Most of the conifers - pines, spruces, firs, hemlocks, cedars, etc. - are evergreen in both the North and South. The needle- or scale-like leaves remain green or greenish the year round, and individual leaves may stay on for two to four or more years. This paragraph talks about the trees that loose leaves. Temperature, light, and water supply have an influence on the degree and the duration of fall color. Low temperatures above freezing will favor anthocyanin formation producing bright reds in maples. However, early frost will weaken the brilliant red color. Rainy and/or overcast days tend to increase the intensity of fall colors. The best time to enjoy the autumn color would be on a clear, dry, and cool (not freezing) day.Enjoy the color, it only occurs for a brief period each fall. This paragraph talks about the weather and how the colors change because of it.
 * Chlorophyll Breaks Down**
 * Other Changes Take Place**
 * Only Some Trees Lose Leaves**
 * Weather Affects Color Intensity**


 * Student: ** Anne Hildebrandt ** Assignment **** : ** Why Do leaves Change Color? ** Period: ** 9


 * ** Possible points ** || ** 1 ** || ** 2 ** || ** 3 ** || ** Max ** ** Points ** ** = 3 ** ||
 * ** Questions ** || Answered || Answered completely with errors || Answered with complete sentences accurately || 3 ||
 * ** Summary ** || Described || Described with errors || Described accurately || 3 ||
 * ** Vocabulary ** || 1term || 2terms || 3+terms || 3 ||
 * ** Total Points ** ||  ||   ||   || 9/9 ||

** Teachers Note: **
 * ** Good job please fix question number 1. **